Mourinho made nine changes but his United side cruised into the fifth round of the FA Cup with a comfortable win over Wigan.
Manchester United secured a 4-0 win over Wigan in the FA Cup on Sunday and following the triumph at Old Trafford, Jose Mourinho said they deserved the win despite not being pleased with his side's first half display.
Marouane Fellaini broke the deadlock in the 44th minute and second half strikes by Chris Smalling, Henrik Mkhitaryan and midfield ace Bastian Schweinsteiger saw United seal a spot in the fifth round of the competition.
"We deserved to win. The first half was not very good but we managed to be 1-0 in front," Mourinho said as manutd.com quoted.
"The goal gave us a different second half, it gave us a chance at half-time to speak with the players and make them feel the first half was not good enough. We spoke about changing a few things in the dynamic of the team. The guys obviously accepted it well because the second half was much better."
On Wigan's challenge, the Portuguese said: "We knew Warren [Joyce] would organise the team very well defensively, with aggression, but we knew that to break that wall we needed to played better than we did in the first half.
"We were quite lucky to be 1-0 up and then in the second half, with more space, we killed the game. We put a different pace into the game, there was much more intense defending, passing and movement. We deserved to win, the job was done and we are in the last 16."
And regarding Schweinsteiger, he added: "He is staying and he is going on the Europa League list because we opened spaces with [Memphis] Depay and [Morgan] Schneiderlin leaving. We don’t have many players; in midfield we don’t have many options, so obviously he is an option.
"Ninety minutes today was probably too hard for him but it was important for him to have an impact with his volley and now I think he’s happy. If he was a good professional when he was not playing, now he’s having some minutes and opportunities he’s going to be the same good professional. With so many matches and competitions, he’s going to be an option."